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<a name="1" href="#1">1</a>   <em class="jxr_javadoccomment">/**</em>
<a name="2" href="#2">2</a>   <em class="jxr_javadoccomment"> * Copyright 2010 Nicholas Blair, Eric Dalquist</em>
<a name="3" href="#3">3</a>   <em class="jxr_javadoccomment"> *</em>
<a name="4" href="#4">4</a>   <em class="jxr_javadoccomment"> * Licensed under the Apache License, Version 2.0 (the "License");</em>
<a name="5" href="#5">5</a>   <em class="jxr_javadoccomment"> * you may not use this file except in compliance with the License.</em>
<a name="6" href="#6">6</a>   <em class="jxr_javadoccomment"> * You may obtain a copy of the License at</em>
<a name="7" href="#7">7</a>   <em class="jxr_javadoccomment"> *</em>
<a name="8" href="#8">8</a>   <em class="jxr_javadoccomment"> *   <a href="http://www.apache.org/licenses/LICENSE-2.0" target="alexandria_uri">http://www.apache.org/licenses/LICENSE-2.0</a></em>
<a name="9" href="#9">9</a>   <em class="jxr_javadoccomment"> *</em>
<a name="10" href="#10">10</a>  <em class="jxr_javadoccomment"> * Unless required by applicable law or agreed to in writing, software</em>
<a name="11" href="#11">11</a>  <em class="jxr_javadoccomment"> * distributed under the License is distributed on an "AS IS" BASIS,</em>
<a name="12" href="#12">12</a>  <em class="jxr_javadoccomment"> * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.</em>
<a name="13" href="#13">13</a>  <em class="jxr_javadoccomment"> * See the License for the specific language governing permissions and</em>
<a name="14" href="#14">14</a>  <em class="jxr_javadoccomment"> * limitations under the License.</em>
<a name="15" href="#15">15</a>  <em class="jxr_javadoccomment"> */</em>
<a name="16" href="#16">16</a>  
<a name="17" href="#17">17</a>  <strong class="jxr_keyword">package</strong> com.googlecode.ecache.annotations.util;
<a name="18" href="#18">18</a>  
<a name="19" href="#19">19</a>  <strong class="jxr_keyword">import</strong> java.lang.reflect.AccessibleObject;
<a name="20" href="#20">20</a>  <strong class="jxr_keyword">import</strong> java.lang.reflect.Field;
<a name="21" href="#21">21</a>  <strong class="jxr_keyword">import</strong> java.lang.reflect.Method;
<a name="22" href="#22">22</a>  <strong class="jxr_keyword">import</strong> java.lang.reflect.Modifier;
<a name="23" href="#23">23</a>  <strong class="jxr_keyword">import</strong> java.util.Collection;
<a name="24" href="#24">24</a>  <strong class="jxr_keyword">import</strong> java.util.Iterator;
<a name="25" href="#25">25</a>  <strong class="jxr_keyword">import</strong> java.util.Map;
<a name="26" href="#26">26</a>  
<a name="27" href="#27">27</a>  <strong class="jxr_keyword">import</strong> org.springframework.util.ReflectionUtils;
<a name="28" href="#28">28</a>  
<a name="29" href="#29">29</a>  <strong class="jxr_keyword">import</strong> com.googlecode.ecache.annotations.utils.Objects;
<a name="30" href="#30">30</a>  
<a name="31" href="#31">31</a>  
<a name="32" href="#32">32</a>  <em class="jxr_javadoccomment">/**</em>
<a name="33" href="#33">33</a>  <em class="jxr_javadoccomment"> * &lt;p&gt;</em>
<a name="34" href="#34">34</a>  <em class="jxr_javadoccomment"> * Reflection-related utility methods.</em>
<a name="35" href="#35">35</a>  <em class="jxr_javadoccomment"> * &lt;/p&gt;</em>
<a name="36" href="#36">36</a>  <em class="jxr_javadoccomment"> *</em>
<a name="37" href="#37">37</a>  <em class="jxr_javadoccomment"> * @author Omar Irbouh</em>
<a name="38" href="#38">38</a>  <em class="jxr_javadoccomment"> * @author Alex Ruiz</em>
<a name="39" href="#39">39</a>  <em class="jxr_javadoccomment"> */</em>
<a name="40" href="#40">40</a>  <strong class="jxr_keyword">public</strong> <strong class="jxr_keyword">abstract</strong> <strong class="jxr_keyword">class</strong> <a href="../../../../../com/googlecode/ecache/annotations/util/Reflections.html">Reflections</a> {
<a name="41" href="#41">41</a>  
<a name="42" href="#42">42</a>    <strong class="jxr_keyword">private</strong> <strong class="jxr_keyword">static</strong> <strong class="jxr_keyword">final</strong> <strong class="jxr_keyword">int</strong> INITIAL_HASH = 7;
<a name="43" href="#43">43</a>  
<a name="44" href="#44">44</a>    <strong class="jxr_keyword">private</strong> <strong class="jxr_keyword">static</strong> <strong class="jxr_keyword">final</strong> <strong class="jxr_keyword">int</strong> MULTIPLIER = 31;
<a name="45" href="#45">45</a>  
<a name="46" href="#46">46</a>    <em class="jxr_javadoccomment">/**</em>
<a name="47" href="#47">47</a>  <em class="jxr_javadoccomment">   * &lt;p&gt;</em>
<a name="48" href="#48">48</a>  <em class="jxr_javadoccomment">   * This method uses reflection to build a valid hash code.</em>
<a name="49" href="#49">49</a>  <em class="jxr_javadoccomment">   * &lt;/p&gt;</em>
<a name="50" href="#50">50</a>  <em class="jxr_javadoccomment">   *</em>
<a name="51" href="#51">51</a>  <em class="jxr_javadoccomment">   * &lt;p&gt;</em>
<a name="52" href="#52">52</a>  <em class="jxr_javadoccomment">   * It uses &lt;code&gt;AccessibleObject.setAccessible&lt;/code&gt; to gain access to</em>
<a name="53" href="#53">53</a>  <em class="jxr_javadoccomment">   * private fields. This means that it will throw a security exception if run</em>
<a name="54" href="#54">54</a>  <em class="jxr_javadoccomment">   * under a security manager, if the permissions are not set up correctly. It</em>
<a name="55" href="#55">55</a>  <em class="jxr_javadoccomment">   * is also not as efficient as testing explicitly.</em>
<a name="56" href="#56">56</a>  <em class="jxr_javadoccomment">   * &lt;/p&gt;</em>
<a name="57" href="#57">57</a>  <em class="jxr_javadoccomment">   *</em>
<a name="58" href="#58">58</a>  <em class="jxr_javadoccomment">   * &lt;p&gt;</em>
<a name="59" href="#59">59</a>  <em class="jxr_javadoccomment">   * Transient members will not be used, as they are likely derived fields,</em>
<a name="60" href="#60">60</a>  <em class="jxr_javadoccomment">   * and not part of the value of the &lt;code&gt;Object&lt;/code&gt;.</em>
<a name="61" href="#61">61</a>  <em class="jxr_javadoccomment">   * &lt;/p&gt;</em>
<a name="62" href="#62">62</a>  <em class="jxr_javadoccomment">   *</em>
<a name="63" href="#63">63</a>  <em class="jxr_javadoccomment">   * &lt;p&gt;</em>
<a name="64" href="#64">64</a>  <em class="jxr_javadoccomment">   * Static fields will not be tested. Superclass fields will be included.</em>
<a name="65" href="#65">65</a>  <em class="jxr_javadoccomment">   * &lt;/p&gt;</em>
<a name="66" href="#66">66</a>  <em class="jxr_javadoccomment">   *</em>
<a name="67" href="#67">67</a>  <em class="jxr_javadoccomment">   * @param obj</em>
<a name="68" href="#68">68</a>  <em class="jxr_javadoccomment">   *          the object to create a &lt;code&gt;hashCode&lt;/code&gt; for</em>
<a name="69" href="#69">69</a>  <em class="jxr_javadoccomment">   * @return the generated hash code, or zero if the given object is</em>
<a name="70" href="#70">70</a>  <em class="jxr_javadoccomment">   *         &lt;code&gt;null&lt;/code&gt;</em>
<a name="71" href="#71">71</a>  <em class="jxr_javadoccomment">   */</em>
<a name="72" href="#72">72</a>    <strong class="jxr_keyword">public</strong> <strong class="jxr_keyword">static</strong> <strong class="jxr_keyword">int</strong> reflectionHashCode(Object obj) {
<a name="73" href="#73">73</a>      <strong class="jxr_keyword">if</strong> (obj == <strong class="jxr_keyword">null</strong>)
<a name="74" href="#74">74</a>        <strong class="jxr_keyword">return</strong> 0;
<a name="75" href="#75">75</a>  
<a name="76" href="#76">76</a>      Class&lt;?&gt; targetClass = obj.getClass();
<a name="77" href="#77">77</a>      <strong class="jxr_keyword">if</strong> (Objects.isArrayOfPrimitives(obj)
<a name="78" href="#78">78</a>          || Objects.isPrimitiveOrWrapper(targetClass)) {
<a name="79" href="#79">79</a>        <strong class="jxr_keyword">return</strong> Objects.nullSafeHashCode(obj);
<a name="80" href="#80">80</a>      }
<a name="81" href="#81">81</a>  
<a name="82" href="#82">82</a>      <strong class="jxr_keyword">if</strong> (targetClass.isArray()) {
<a name="83" href="#83">83</a>        <strong class="jxr_keyword">return</strong> reflectionHashCode((Object[]) obj);
<a name="84" href="#84">84</a>      }
<a name="85" href="#85">85</a>  
<a name="86" href="#86">86</a>      <strong class="jxr_keyword">if</strong> (obj instanceof Collection&lt;?&gt;) {
<a name="87" href="#87">87</a>        <strong class="jxr_keyword">return</strong> reflectionHashCode((Collection&lt;?&gt;) obj);
<a name="88" href="#88">88</a>      }
<a name="89" href="#89">89</a>  
<a name="90" href="#90">90</a>      <strong class="jxr_keyword">if</strong> (obj instanceof Map&lt;?, ?&gt;) {
<a name="91" href="#91">91</a>        <strong class="jxr_keyword">return</strong> reflectionHashCode((Map&lt;?, ?&gt;) obj);
<a name="92" href="#92">92</a>      }
<a name="93" href="#93">93</a>  
<a name="94" href="#94">94</a>  		<em class="jxr_comment">// determine whether the object's class declares hashCode() or has a</em>
<a name="95" href="#95">95</a>  		<em class="jxr_comment">// superClass other than java.lang.Object that declares hashCode()</em>
<a name="96" href="#96">96</a>  		Class&lt;?&gt; clazz = (obj instanceof Class&lt;?&gt;)? (Class&lt;?&gt;) obj : obj.getClass();
<a name="97" href="#97">97</a>  		Method hashCodeMethod = ReflectionUtils.findMethod(clazz,
<a name="98" href="#98">98</a>  				<span class="jxr_string">"hashCode"</span>, <strong class="jxr_keyword">new</strong> Class[0]);
<a name="99" href="#99">99</a>  
<a name="100" href="#100">100</a> 		<strong class="jxr_keyword">if</strong> (hashCodeMethod != <strong class="jxr_keyword">null</strong>) {
<a name="101" href="#101">101</a> 			<strong class="jxr_keyword">return</strong> obj.hashCode();
<a name="102" href="#102">102</a> 		}
<a name="103" href="#103">103</a> 
<a name="104" href="#104">104</a> 		<em class="jxr_comment">// could not find a hashCode other than the one declared by java.lang.Object</em>
<a name="105" href="#105">105</a> 		<strong class="jxr_keyword">int</strong> hash = INITIAL_HASH;
<a name="106" href="#106">106</a> 
<a name="107" href="#107">107</a>     <strong class="jxr_keyword">try</strong> {
<a name="108" href="#108">108</a>       <strong class="jxr_keyword">while</strong> (targetClass != <strong class="jxr_keyword">null</strong>) {
<a name="109" href="#109">109</a>         Field[] fields = targetClass.getDeclaredFields();
<a name="110" href="#110">110</a>         AccessibleObject.setAccessible(fields, <strong class="jxr_keyword">true</strong>);
<a name="111" href="#111">111</a> 
<a name="112" href="#112">112</a>         <strong class="jxr_keyword">for</strong> (<strong class="jxr_keyword">int</strong> i = 0; i &lt; fields.length; i++) {
<a name="113" href="#113">113</a>           Field field = fields[i];
<a name="114" href="#114">114</a>           <strong class="jxr_keyword">int</strong> modifiers = field.getModifiers();
<a name="115" href="#115">115</a> 
<a name="116" href="#116">116</a>           <strong class="jxr_keyword">if</strong> (!Modifier.isStatic(modifiers) &amp;&amp; !Modifier.isTransient(modifiers)) {
<a name="117" href="#117">117</a>             hash = MULTIPLIER * hash + reflectionHashCode(field.get(obj));
<a name="118" href="#118">118</a>           }
<a name="119" href="#119">119</a>         }
<a name="120" href="#120">120</a>         targetClass = targetClass.getSuperclass();
<a name="121" href="#121">121</a>       }
<a name="122" href="#122">122</a>     } <strong class="jxr_keyword">catch</strong> (IllegalAccessException exception) {
<a name="123" href="#123">123</a>       <em class="jxr_comment">// ///CLOVER:OFF</em>
<a name="124" href="#124">124</a>       ReflectionUtils.handleReflectionException(exception);
<a name="125" href="#125">125</a>       <em class="jxr_comment">// ///CLOVER:ON</em>
<a name="126" href="#126">126</a>     }
<a name="127" href="#127">127</a> 
<a name="128" href="#128">128</a>     <strong class="jxr_keyword">return</strong> hash;
<a name="129" href="#129">129</a>   }
<a name="130" href="#130">130</a> 
<a name="131" href="#131">131</a>   <strong class="jxr_keyword">private</strong> <strong class="jxr_keyword">static</strong> <strong class="jxr_keyword">int</strong> reflectionHashCode(Collection&lt;?&gt; collection) {
<a name="132" href="#132">132</a>     <strong class="jxr_keyword">int</strong> hash = INITIAL_HASH;
<a name="133" href="#133">133</a> 
<a name="134" href="#134">134</a>     <strong class="jxr_keyword">for</strong> (Iterator&lt;?&gt; i = collection.iterator(); i.hasNext();) {
<a name="135" href="#135">135</a>       hash = MULTIPLIER * hash + reflectionHashCode(i.next());
<a name="136" href="#136">136</a>     }
<a name="137" href="#137">137</a> 
<a name="138" href="#138">138</a>     <strong class="jxr_keyword">return</strong> hash;
<a name="139" href="#139">139</a>   }
<a name="140" href="#140">140</a> 
<a name="141" href="#141">141</a>   <strong class="jxr_keyword">private</strong> <strong class="jxr_keyword">static</strong> <strong class="jxr_keyword">int</strong> reflectionHashCode(Map&lt;?, ?&gt; map) {
<a name="142" href="#142">142</a>     <strong class="jxr_keyword">int</strong> hash = INITIAL_HASH;
<a name="143" href="#143">143</a> 
<a name="144" href="#144">144</a>     <strong class="jxr_keyword">for</strong> (Iterator&lt;?&gt; i = map.entrySet().iterator(); i.hasNext();) {
<a name="145" href="#145">145</a>       Map.Entry&lt;?, ?&gt; entry = (Map.Entry&lt;?, ?&gt;) i.next();
<a name="146" href="#146">146</a>       hash = MULTIPLIER * hash + reflectionHashCode(entry);
<a name="147" href="#147">147</a>     }
<a name="148" href="#148">148</a> 
<a name="149" href="#149">149</a>     <strong class="jxr_keyword">return</strong> hash;
<a name="150" href="#150">150</a>   }
<a name="151" href="#151">151</a> 
<a name="152" href="#152">152</a>   <strong class="jxr_keyword">private</strong> <strong class="jxr_keyword">static</strong> <strong class="jxr_keyword">int</strong> reflectionHashCode(Map.Entry&lt;?, ?&gt; entry) {
<a name="153" href="#153">153</a>     <strong class="jxr_keyword">int</strong> hash = INITIAL_HASH;
<a name="154" href="#154">154</a>     hash = MULTIPLIER * hash + reflectionHashCode(entry.getKey());
<a name="155" href="#155">155</a>     hash = MULTIPLIER * hash + reflectionHashCode(entry.getValue());
<a name="156" href="#156">156</a>     <strong class="jxr_keyword">return</strong> hash;
<a name="157" href="#157">157</a>   }
<a name="158" href="#158">158</a> 
<a name="159" href="#159">159</a>   <strong class="jxr_keyword">private</strong> <strong class="jxr_keyword">static</strong> <strong class="jxr_keyword">int</strong> reflectionHashCode(Object[] array) {
<a name="160" href="#160">160</a>     <strong class="jxr_keyword">int</strong> hash = INITIAL_HASH;
<a name="161" href="#161">161</a>     <strong class="jxr_keyword">int</strong> arraySize = array.length;
<a name="162" href="#162">162</a>     <strong class="jxr_keyword">for</strong> (<strong class="jxr_keyword">int</strong> i = 0; i &lt; arraySize; i++) {
<a name="163" href="#163">163</a>       hash = MULTIPLIER * hash + reflectionHashCode(array[i]);
<a name="164" href="#164">164</a>     }
<a name="165" href="#165">165</a> 
<a name="166" href="#166">166</a>     <strong class="jxr_keyword">return</strong> hash;
<a name="167" href="#167">167</a>   }
<a name="168" href="#168">168</a> }
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